that's going to do it for us tonight. >> thanks for joining us. nightly news is coming up next. we'll see you at 6:00. >> bye bye. >>> on the b >>> on the broadcast tonight, up in the air. the feds ground a mega merger between two airline giants, warning about higher fares and fees and fewer choices. tonight, what it really means for everyone who flies. >>> what lies beneath. a nightmare for thousands of homeowners living on top of sinkholes. tonight, a rare look deep down, where all those problems begin. >>> paying the price for obama care. designed to provide health care for all, but some businesses are cutting back to avoid the costs, doing some american workers more harm than good. >>> and the baby boom. for a lot of couples who have struggled to have a child, including new dad jimmy fallon, sharing his story tonight with savannah guthrie. "nightly news" begins now.